Question about 2003 Aprilia RSV Mille

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What Spark plugs to install?

Ok what spark plugs does everyone run? It's time for me to change.....I have been running the NGK Iridium plugs and didn't notice any performance difference. Been running the NGK DCPR9EIX. My bike seems to be running lean / hot. Would the DCPR8*** be a hotter burning plug?

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  • Anonymous Mar 17, 2014

    need champion spark plug to match ngk cr5hsb


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Yes the 8 is the hotter plug just for giggles how do you know that it's running lean? have you had someone put it to the 4or5 gas analyzer, NOT A DYNOJET DYNO? it's the only way to know for sure and by how much. the reason i say not the dyno-jet is because of the fact that it uses a wide band 02 sensor which in this case only gives a limited amount of info versus the 4gas. some people have said the hotter plugs has run better for them, but i can'tconfirm. i can confirm that i hadn't noticed much difference between the Iridium plugs and the stock. no improvement on the dyno and nothing really noticeable anywhere else. for the price of stock NGK's thats what i would stay with. marco,,,

Posted on Nov 10, 2008

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